Hamilton weather in September

In September, Hamilton sees average daytime highs of 16°C and overnight lows near 8°C, with 114 mm of rain across 13.9 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 16°C through the month. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 06 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Hamilton's 9th-clearest and 3rd-windiest month. For the whole year in context, see Hamilton's year-round climate.

Daytime high: 16°; 9th warmest
Overnight low: 8°; 4th coldest
Rainfall: 114 mm; 13.9 wet days
Daylight: 11 h 48 min; 7:20 AM – 7:06 PM
Cloud cover: 66%; 9th clearest
Wind: 14 km/h; 3rd windiest
Solar energy: 3.7 kWh/m²
Travel score: 4.3; out of 10

Hamilton is largest city in New Zealand's Waikato region.

Air quality: Excellent; PM10 13.4 µg/m³ · 2012
Density: 1,734/km²; people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Hamilton year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 16°C through the month.

A typical September day in Hamilton reaches about 16°C in the afternoon and slips back to 8°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 18°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C cooler than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16
Avg low (°C)	7	7	7	7	7	7	7	7	7	7	8	8	8	8	8	8	8	8	8	8	8	8	8	9	9	9	9	9	9	9

	Avg high (°C)	Avg low (°C)
1	15	7
2	15	7
3	15	7
4	15	7
5	15	7
6	15	7
7	15	7
8	15	7
9	15	7
10	15	7
11	15	8
12	15	8
13	16	8
14	16	8
15	16	8
16	16	8
17	16	8
18	16	8
19	16	8
20	16	8
21	16	8
22	16	8
23	16	8
24	16	9
25	16	9
26	16	9
27	16	9
28	16	9
29	16	9
30	16	9

Hamilton weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	23° / 15°	71	8.8	14.3	6.9
Feb	24° / 15°	70	7.9	13.5	7.1
Mar	22° / 13°	72	7.8	12.3	7.0
Apr	19° / 11°	91	9.4	11.1	6.2
May	17° / 9°	107	11.6	10	5.2
Jun	14° / 7°	114	12.3	9.4	4.0
Jul	14° / 6°	128	13.5	9.7	3.6
Aug	14° / 6°	122	14.8	10.5	3.8
Sep	16° / 8°	114	13.9	11.7	4.3
Oct	17° / 10°	100	12.7	13	5.1
Nov	19° / 11°	88	11.1	14	5.7
Dec	21° / 13°	99	11	14.6	6.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 59%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	44	43	43	43	43	42	42	42	41	41	40	40	40	41	41	40	40	40	40	40	39	40	40	40	40	39	39	40	40	40
Cloudier (%)	56	57	57	57	57	58	58	58	59	59	60	60	60	59	59	60	60	60	60	60	61	60	60	60	60	61	61	60	60	60

	Clearer (%)	Cloudier (%)
1	44	56
2	43	57
3	43	57
4	43	57
5	43	57
6	42	58
7	42	58
8	42	58
9	41	59
10	41	59
11	40	60
12	40	60
13	40	60
14	41	59
15	41	59
16	40	60
17	40	60
18	40	60
19	40	60
20	40	60
21	39	61
22	40	60
23	40	60
24	40	60
25	40	60
26	39	61
27	39	61
28	40	60
29	40	60
30	40	60

Chance of precipitation in September

Any precipitation

Hamilton gets around 114 mm of rain over 13.9 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 46% and peaks near 48% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	41	41	42	42	43	43	44	45	45	46	46	46	46	46	46	46	46	46	46	47	47	47	47	47	48	48	47	47	47	47

	Rain chance (%)
1	41
2	41
3	42
4	42
5	43
6	43
7	44
8	45
9	45
10	46
11	46
12	46
13	46
14	46
15	46
16	46
17	46
18	46
19	46
20	47
21	47
22	47
23	47
24	47
25	48
26	48
27	47
28	47
29	47
30	47

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	98	98	97	97	97	96	96	96	95	95	95	95	95	95	95	95	94	94	94	94	94	93	93	93	93	92	92	92	91	91
Comfortable (%)	2	2	3	3	3	4	4	4	5	5	5	5	5	5	5	5	6	6	6	6	6	7	7	7	7	8	8	8	9	9

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	97	3
4	97	3
5	97	3
6	96	4
7	96	4
8	96	4
9	95	5
10	95	5
11	95	5
12	95	5
13	95	5
14	95	5
15	95	5
16	95	5
17	94	6
18	94	6
19	94	6
20	94	6
21	94	6
22	93	7
23	93	7
24	93	7
25	93	7
26	92	8
27	92	8
28	92	8
29	91	9
30	91	9

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	13	13	13	14	14	14	14	14	14	14	14	14	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	16
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	13	light breeze
2	13	light breeze
3	13	light breeze
4	14	light breeze
5	14	light breeze
6	14	light breeze
7	14	light breeze
8	14	light breeze
9	14	light breeze
10	14	light breeze
11	14	light breeze
12	14	light breeze
13	14	light breeze
14	14	light breeze
15	14	light breeze
16	14	light breeze
17	14	light breeze
18	15	light breeze
19	15	light breeze
20	15	light breeze
21	15	light breeze
22	15	light breeze
23	15	light breeze
24	15	light breeze
25	15	light breeze
26	15	light breeze
27	15	light breeze
28	15	light breeze
29	15	light breeze
30	16	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 06 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 72 minutes over September. Sunrise moves from 7:44 AM to 6:58 AM, and sunset from 6:53 PM to 7:18 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	11.1	11.2	11.2	11.3	11.3	11.3	11.4	11.4	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.8	11.8	11.8	11.9	11.9	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.3	12.3	12.3
Sunrise (AM)	7:44	7:43	7:41	7:40	7:38	7:36	7:35	7:33	7:32	7:30	7:28	7:27	7:25	7:24	7:22	7:20	7:19	7:17	7:16	7:14	7:12	7:11	7:09	7:07	7:06	7:04	7:03	7:01	6:59	6:58
Sunset (PM)	6:53	6:54	6:55	6:56	6:56	6:57	6:58	6:59	7:00	7:01	7:02	7:03	7:03	7:04	7:05	7:06	7:07	7:08	7:09	7:10	7:10	7:11	7:12	7:13	7:14	7:15	7:16	7:17	7:18	7:18

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.1	7:44	6:53
2	11.2	7:43	6:54
3	11.2	7:41	6:55
4	11.3	7:40	6:56
5	11.3	7:38	6:56
6	11.3	7:36	6:57
7	11.4	7:35	6:58
8	11.4	7:33	6:59
9	11.5	7:32	7:00
10	11.5	7:30	7:01
11	11.6	7:28	7:02
12	11.6	7:27	7:03
13	11.6	7:25	7:03
14	11.7	7:24	7:04
15	11.7	7:22	7:05
16	11.8	7:20	7:06
17	11.8	7:19	7:07
18	11.8	7:17	7:08
19	11.9	7:16	7:09
20	11.9	7:14	7:10
21	12.0	7:12	7:10
22	12.0	7:11	7:11
23	12.1	7:09	7:12
24	12.1	7:07	7:13
25	12.1	7:06	7:14
26	12.2	7:04	7:15
27	12.2	7:03	7:16
28	12.3	7:01	7:17
29	12.3	6:59	7:18
30	12.3	6:58	7:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.7 kWh/m².

For context, solar energy here swings from a low near 1.84 kWh/m² to a high of 6.61 kWh/m² in January across the year — September's 3.7 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	3.2	3.2	3.3	3.3	3.3	3.4	3.4	3.4	3.5	3.5	3.5	3.6	3.6	3.6	3.7	3.7	3.8	3.8	3.8	3.9	3.9	3.9	4.0	4.0	4.0	4.1	4.1	4.2	4.2	4.2
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.2	Moderate
2	3.2	Moderate
3	3.3	Moderate
4	3.3	Moderate
5	3.3	Moderate
6	3.4	Moderate
7	3.4	Moderate
8	3.4	Moderate
9	3.5	Moderate
10	3.5	Moderate
11	3.5	Moderate
12	3.6	Moderate
13	3.6	Moderate
14	3.6	Moderate
15	3.7	Moderate
16	3.7	Moderate
17	3.8	Moderate
18	3.8	Moderate
19	3.8	Moderate
20	3.9	Moderate
21	3.9	Moderate
22	3.9	Moderate
23	4.0	Moderate
24	4.0	Bright
25	4.0	Bright
26	4.1	Bright
27	4.1	Bright
28	4.2	Bright
29	4.2	Bright
30	4.2	Bright

Planning a trip in September

Hazard calendar for Hamilton

In seasonPeak

None of Hamilton's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Hamilton sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Cyclone

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Hamilton?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.3

Sightseeing

9th-best month of the year

0.4

Beach & pool

9th-best month of the year

September is a reasonable time to visit Hamilton for sightseeing.

What to pack for Hamilton in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Hamilton sees daytime highs around 16°C and nights near 8°C. Pack rain gear. Worth having: a warm layer. About 14 days see rain.

rain geara warm layer

Sea temperature near Hamilton in September

The nearest coast averages about 14°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 40 km away) is warmest in February at about 21°C and coldest in August near 14°C.

It's comfortable for a long swim from Jan 17 to Mar 15 — about 1.9 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	20	21	20	19	17	15	14	14	14	15	17	19
Comfort	Refreshing	Refreshing	Refreshing	Cool	Cool	Cool	Bracing	Bracing	Bracing	Cool	Cool	Cool

	Sea temperature (°C)	Comfort
Jan	20	Refreshing
Feb	21	Refreshing
Mar	20	Refreshing
Apr	19	Cool
May	17	Cool
Jun	15	Cool
Jul	14	Bracing
Aug	14	Bracing
Sep	14	Bracing
Oct	15	Cool
Nov	17	Cool
Dec	19	Cool

UV index in Hamilton in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hamilton peaks around January 12 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	12	11	8	5	3	2	2	3	5	7	11	12
Level	Extreme	Extreme	Very high	High	Moderate	Low	Moderate	Moderate	Moderate	Very high	Extreme	Extreme

	UV index (midday)	Level
Jan	12	Extreme
Feb	11	Extreme
Mar	8	Very high
Apr	5	High
May	3	Moderate
Jun	2	Low
Jul	2	Moderate
Aug	3	Moderate
Sep	5	Moderate
Oct	7	Very high
Nov	11	Extreme
Dec	12	Extreme

Location & terrain

Where is Hamilton?

Hamilton sits at 37.8°S, 175.3°E, 39 m above sea level, in New Zealand. The nearest listed city is Hamilton East, 1.0 km away.

Topography around Hamilton

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hamilton.

Within 3 km, the terrain around Hamilton has only modest variations in elevation — a maximum elevation change of 59 m around an average of 39 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 166 m; within 80 km, large variations in elevation — a maximum elevation change of 1,023 m.

The land around Hamilton is covered by artificial surfaces (57%) and trees (23%) within 3 km, grassland (67%) within 16 km, and grassland (51%) and trees (26%) within 80 km.

3 km

59 m

artificial surfaces 57%

16 km

166 m

grassland 67%

80 km

1,023 m

grassland 51%

treesgrasslandcroplandartificial surfaceswaterwetland

← August Hamilton year-round climate October →Best places to visit in September

September weather nearby: Hamilton East 1.0 km · Cambridge 17 km · Pukekohe East 71 km · Tauranga 78 km · Papakura 85 km · Takanini 88 km · Manurewa 92 km · Rotorua 93 km

New Zealand travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type I; 230 V · 50 Hz
Prices: ≈ 86% of US; price level, 2025
GDP per capita: $49,591; 2025
Happiness: 7.0 / 10; World Happiness, 2025
Safe drinking water: 100%; of population, 2024
Homicide rate: 1.5; per 100k, 2022
Road deaths: 9.6; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hamilton (-37.7833°, 175.2833°, elevation 39 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	15	7
2	15	7
3	15	7
4	15	7
5	15	7
6	15	7
7	15	7
8	15	7
9	15	7
10	15	7
11	15	8
12	15	8
13	16	8
14	16	8
15	16	8
16	16	8
17	16	8
18	16	8
19	16	8
20	16	8
21	16	8
22	16	8
23	16	8
24	16	9
25	16	9
26	16	9
27	16	9
28	16	9
29	16	9
30	16	9

	Clearer (%)	Cloudier (%)
1	44	56
2	43	57
3	43	57
4	43	57
5	43	57
6	42	58
7	42	58
8	42	58
9	41	59
10	41	59
11	40	60
12	40	60
13	40	60
14	41	59
15	41	59
16	40	60
17	40	60
18	40	60
19	40	60
20	40	60
21	39	61
22	40	60
23	40	60
24	40	60
25	40	60
26	39	61
27	39	61
28	40	60
29	40	60
30	40	60

	Rain chance (%)
1	41
2	41
3	42
4	42
5	43
6	43
7	44
8	45
9	45
10	46
11	46
12	46
13	46
14	46
15	46
16	46
17	46
18	46
19	46
20	47
21	47
22	47
23	47
24	47
25	48
26	48
27	47
28	47
29	47
30	47

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	97	3
4	97	3
5	97	3
6	96	4
7	96	4
8	96	4
9	95	5
10	95	5
11	95	5
12	95	5
13	95	5
14	95	5
15	95	5
16	95	5
17	94	6
18	94	6
19	94	6
20	94	6
21	94	6
22	93	7
23	93	7
24	93	7
25	93	7
26	92	8
27	92	8
28	92	8
29	91	9
30	91	9

	Avg high (°C)	Avg low (°C)
1	15	7
2	15	7
3	15	7
4	15	7
5	15	7
6	15	7
7	15	7
8	15	7
9	15	7
10	15	7
11	15	8
12	15	8
13	16	8
14	16	8
15	16	8
16	16	8
17	16	8
18	16	8
19	16	8
20	16	8
21	16	8
22	16	8
23	16	8
24	16	9
25	16	9
26	16	9
27	16	9
28	16	9
29	16	9
30	16	9

	Clearer (%)	Cloudier (%)
1	44	56
2	43	57
3	43	57
4	43	57
5	43	57
6	42	58
7	42	58
8	42	58
9	41	59
10	41	59
11	40	60
12	40	60
13	40	60
14	41	59
15	41	59
16	40	60
17	40	60
18	40	60
19	40	60
20	40	60
21	39	61
22	40	60
23	40	60
24	40	60
25	40	60
26	39	61
27	39	61
28	40	60
29	40	60
30	40	60

	Rain chance (%)
1	41
2	41
3	42
4	42
5	43
6	43
7	44
8	45
9	45
10	46
11	46
12	46
13	46
14	46
15	46
16	46
17	46
18	46
19	46
20	47
21	47
22	47
23	47
24	47
25	48
26	48
27	47
28	47
29	47
30	47

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	97	3
4	97	3
5	97	3
6	96	4
7	96	4
8	96	4
9	95	5
10	95	5
11	95	5
12	95	5
13	95	5
14	95	5
15	95	5
16	95	5
17	94	6
18	94	6
19	94	6
20	94	6
21	94	6
22	93	7
23	93	7
24	93	7
25	93	7
26	92	8
27	92	8
28	92	8
29	91	9
30	91	9

	Avg high (°C)	Avg low (°C)
1	15	7
2	15	7
3	15	7
4	15	7
5	15	7
6	15	7
7	15	7
8	15	7
9	15	7
10	15	7
11	15	8
12	15	8
13	16	8
14	16	8
15	16	8
16	16	8
17	16	8
18	16	8
19	16	8
20	16	8
21	16	8
22	16	8
23	16	8
24	16	9
25	16	9
26	16	9
27	16	9
28	16	9
29	16	9
30	16	9

	Clearer (%)	Cloudier (%)
1	44	56
2	43	57
3	43	57
4	43	57
5	43	57
6	42	58
7	42	58
8	42	58
9	41	59
10	41	59
11	40	60
12	40	60
13	40	60
14	41	59
15	41	59
16	40	60
17	40	60
18	40	60
19	40	60
20	40	60
21	39	61
22	40	60
23	40	60
24	40	60
25	40	60
26	39	61
27	39	61
28	40	60
29	40	60
30	40	60

	Rain chance (%)
1	41
2	41
3	42
4	42
5	43
6	43
7	44
8	45
9	45
10	46
11	46
12	46
13	46
14	46
15	46
16	46
17	46
18	46
19	46
20	47
21	47
22	47
23	47
24	47
25	48
26	48
27	47
28	47
29	47
30	47

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	97	3
4	97	3
5	97	3
6	96	4
7	96	4
8	96	4
9	95	5
10	95	5
11	95	5
12	95	5
13	95	5
14	95	5
15	95	5
16	95	5
17	94	6
18	94	6
19	94	6
20	94	6
21	94	6
22	93	7
23	93	7
24	93	7
25	93	7
26	92	8
27	92	8
28	92	8
29	91	9
30	91	9